The car is turning over but will not start

When I first got the car I ran perfectly fine, however it has been sat over the christmas period not doing anything. Also I lost the key code to start the engine. I entered it wrong quite a few times. However I also purchased a new battery which I thought might be the problem. I then found the key code. I disconnected battery left for a day reconnected and waited a while to enter correct key code. This still did not start the engine. There is no spark although its turning over. Do you have any idea what is wrong with it and any possible solutions to get it going.?
kind regards